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iLo DTV2784 Vertical Deflection Problem    
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pensacol



Joined: 02 Jul 2009
Posts: 30

PostPosted: Mon Sep 07, 2009 11:56 pm    Post subject: iLo DTV2784 Vertical Deflection Problem Reply with quote

Tv had about a 4" horizontal line in the middle of the screen. Found bad caps C403, C406, C407 and bad R411. Replaced those. Now the vertical pincushion is off but goes all the way to the top and bottom of the screen. Horizontal is only about 8" in the middle though. I can't find a schematic for this anywhere, so I am going by trial and error. Anybody have any suggestion for this set?

Thanks guys.
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JTS1957



Joined: 21 Jan 2009
Posts: 2395
Location: Far, Far Away

PostPosted: Tue Sep 08, 2009 1:55 am    Post subject: Reply with quote

From the web:

ILO Orion
DTV2784
Symptom Pic. Shrunk (about 4", vert. foldover voltage to vert output. only 19V, should be 27V..Found C403 22uf@50v. C406 1uf@50v. C407 100uf@35v, C436 10uf-50V, C413 1000uf-35V, C426 22uf-250V, C432 47uf-160V, C408 2200uf-25V and C430 22uf-100V. In the set I am repairing all these caps were measured far low in value!! .Also check R411 5.6@ 2W. May have changed value to 18 ohms also neg lead open trace to pin 7 of vertical output IC Replacing all caps and Resistor fixed the set!
pensacol



Joined: 02 Jul 2009
Posts: 30

PostPosted: Thu Sep 10, 2009 8:53 pm    Post subject: Reply with quote

That was it. Every cap was bad, I changed them and then found the lifted trace on pin 7 of IC. Repaired trace and everything works like a charm. It's amazing how set's like these can have exactly the same problems like that. Thanks guys for all your help.
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